Means for reducing air currents in centrifugal machines



May 11 ,1925, 1,584,488

K. .1. SVENSSON ET AL MEANS FOR REDUCING AIR CURRENT-S IN CENTRIFUGAL MACHINES Filed August 5. 1925 I N VE N TOP Si girl filer; 5 W115 on Patented May 11, 1926.

UNITED STATES PATENT OFFICE.

KARL JO H AN SVENSSON AND KARL AXEL PATBIK NOBLING, 01E LONDON, ENGLAND.

MEANS FOR REDUCING AIR CURRENTS IN CENTRIFUGAL MACHINES.

Application filed August 3, 1923.

In centrifugal separating machines for liquids it frequently happens that the rapid rotation of the centrifugal drum causes an air current not only from the lower collecting vessel down into that part of the stand which surrounds the drum, but also from one collecting veszel into another. As the liquids are discharged from the centrifugal drum at a very high speed the collecting vessels are to a great extent charged with liquid in a highly vaporized or spray-like condition. Ifsuch airscurrents be suiticiently strong, an appreciable amount of the liquid is carried along by this current with the result that liquid from the lower collecting vessel is sucked down into the upper portion of the stand and as this liquid contains, as a rule, a large percentage of water, itcan easily damage the upper moving parts of the machine. If, on the other hand, the liquid be sucked from one collecting vessel into another the separating capacity of the machine becomes more or less impaired.

The present invention has for its object so to reduce the force of these air-currents as to obviate the above mentioned disadvantages. To this end one or more rings or spiral-ribs of a suit-able and proper height is or are fixed on the bottom of a collecting vessel or on the bottoms of the collecting vessels or other Suitable places, so as to encircle the upper part of the centrifugal drum. The air-currents, which are set up by the centrifugal motion are so influenced by these rings or ribs that the speed of the air-currents is greatly reduced. In stead of fixingthe rings or spiral rib to the bottom of a collecting vessel, they may also be fixed direct on the centrifugal drum.

In the accompanying drawings three suitable forms of construction are illustrated Figure 1 being a central sectional elevation of one form and Figure 2 a plan thereof, whilst Figures 3 and t are similar views of a second form and Figures 5 and 6 similar views of a third form.

1 designates the centrifugal drum, 2 the upper portion of the stand surrounding the centrifugal drum, .8 the lower part of the @low-ercolleeting vessel and a the lower part of the upper collecting vessel.

In the form shown in Figures 1 and 2 two rings ,5 and 6 of suitable height are attached 'to the under surface of the lower part i of the upper collecting vessel, and two similar rings 7 and 8 are attached to the Serial No. 655,502.

undersurface of the lower part 3 lower collecting vessel.

Figures 3 and 4. show a modified construction in which two rings 9 and 10 are fixed to the undersurface or bottom of the lower part 3 of the lower collecting vessel and two rings 11 and 12 are fixed to the upper part of the centrifugal drum 1 itself, the rings on the two parts alternating.

Figures 5 and 6 show a further modification in whicl'i, instead of a number of rings, a spiral-shaped rib 13 is attached to the undersurface of the lower part 3 of the lower collecting vessel, said spiral rib functioning in much the same manner as a number of rings. I

IV e claim:

1. In a centrifugal machine for separating liquids of in combination, a stand, a bowl provided with openings for the passage of separated liquids, collecting vessels for the separated liquids disposed about said bowl, said ves sels having a passageway affording communication between the same, and means for preventing liquid from being sucked from one collecting vessel to another, consisting of a ring attached to the bottom ,of one of said collecting vessels and adapted to reduce the speed of the air currents set up by the centrifugal motion.

2. In a centrifugal machine for separating liquids of diii'erent specific gra-vities, in combination, a stand, a centrifugal drum, a bowl situated above said stand and provided with openings for the passage of separated liquids, collecting vessels for the sepa rated liquids also situated one above another above said stand and disposed about said bowl, said vessels havin a passageway affording communication between the same, and means for preventing liquid from being sucked from one collecting vessel to another and from the lower collecting vessel down into the upper portion of said stand, said means consisting of a ring attached :to the top of the centrifugal drun'i and being adapted to reduce the speed of the air currents setup by the centrifugal motion.

3. In a centrifugal machine for separating liquids of different specific gravities, in cornlunation, a stand, a centrifugal drum, a bowl situated above said stand and provided with openings for the )assage of separated of the liquids, collecting vessels for he separated diiferent specific gravities,

liquids also situated one above another above said stand and disposed about said bowl, said vessels having a passageway affording communication bet-ween the same, and means for preventing liquid from being sucked from one collecting vessel to another and from the lower collecting vessel down into the upper portion of the stand, said means consisting of rings attached to the bottom of one of said collecting vessels, and said rings being adapted to reduce the speed of the air currents set up by the centrifugal motion.

4'. In a centrifugal machine for separating liquids of different specific gravities, in combination, a stand, a centrifugal drum, a bowl situated above said stand and provided with openings for the passage of separated liquids, collecting vessels for the separated liquids also situated one above another above said stand and disposed about said bowl, said vessels having a passageway affording communication between the same, and means for preventing liquid from being sucked from one collecting vessel to another and from the lower collecting vessel down into the upper portion ofthe stand, said means consisting of a spiral rib attached to the bottom of one of said collecting vessels, and said rib being adapted to reduce the speed of the air currents set up by the centrifugal motion. 7

5. In a centrifugal machine for separating liquids of different specific gravities, in combination, a stand, a centrifugal drum, a bowl situated above said stand and provided with openings for the passage of separated liquids, collecting vessels for the separated liquics also situated one above another above said stand and disposed-about said bowl, said vessels having a passageway affording communication between the same, and means for preventing liquid from being sucked from one collecting vessel to another and from the lower collecting vessel down into the upper portion of the stand, said means consisting of a spiral rib attached to the top of the centrifugal drum, and said rib being adapted to reduce the speed of the air currents set up by the centrifugal motion.

6. In a centrifugal machine for separating liquids of different specific gravities, in combination, a stand, a centrifugal drum, a bowl situated above said stand and provided with openings for the passage of separated liquids, collecting vessels forthe separated liquids also situated one above another above said stand and disposed about said bowl, said vessels having a passageway affording communication between the same, and means for preventing liquid from being sucked from one Collecting vessel to another and from the lower collecting vessel down into the upper portion of the stand, said means consisting of rings attached to the bottoms of the collecting vessels, and said rings being adapted to reduce the speed of the air currents set up by the centrifugal motion,

7. In a centrifugal machine for separating liquids of different specific gravities, in combination, a stand, a centrifugal drum, a bowl situated above said stand and provided with openings for the passage of separated liquids, collecting vessels for the separated liquids also situated one above another above said stand and disposed about said bowl, said vessels having a passageway affording communication between the same, and means for preventing liquid from being sucked from one collecting vessel to another and from the lower collecting vessel down into the upper portion of the stand, said means consisting of rings attached to the bottom of one of said collecting vessels and to the top of the centrifugal drum, and said rings being adapted to reduce the speed of the air currents set up by the centrifugal motion.

8. In a centrifugal machine for separating liquids of different specific gravities, in combination, a stand, a centrifugal drum, a bowl situated above said stand and provided with openings for the passage of separated liquids, collecting vessels for the separated liquids also situated one above another above said stand and disposed about said bowl, said vessels having a passageway affording communication between the same, and means for preventing liquid from being sucked from one collecting vessel to another and from the lower collecting vessel down into the upper portion of the stand, said means consisting of rings attached to the top of the centrifugal drum, and said rings being adapted to reduce the speed of the aircurrents set up by the centrifugal motion.

9.'In a centrifugal machine for separating liquids of difi'erent specific gravities, in combination, a stand, a centrifugal drum, a bowl situated above said stand and provided with openings for thepassage of separated liquids, collecting vessels for the separated liquids also situated one above another above said stand and disposed about said bowl, said vessels having a passageway affording communication between the same, and means for preventing liquid from being sucked from one collecting vessel to another and from the lower collect ng vessel down into the upper portion of the stand, said means consisting of rings attached to the centrifugal drum and to the under surface of the lower part of the lower collecting vessel so as to alternate, and said rin s being adapted to reduce the speed of the air currents set up by the centrifugal motion.

10, In a centrifugal machine for separating liquids of dnferent specific gravities, in combination, a bow] provided with openings for the passage of separated liquids, collectingvessels for the separatedliquids disposed about said bowl, said vessels being separated by a partition, a passageway affording coin inunication between said vessels, and a baflie extending in angular relation to said partition and positioned adjacent to said passageway to prevent the passage of particles of liquid entrained bv air currents passing from one vessel to the other.

11. In a centrifugal machine for separating liquids of different specific gravities, in combination, a bowl provided with openings for the passage 0 separated liquids, collecting vessels for the separated liquids disposed about said bowl, said vessels being separated by a partition, a passageway affording communication between said vessels, and a baflie extending from the lower side of said partition and at an angle thereto, said bafile being positioned adjacent to said passageway and from the lower to adapted to prevent the passage of particles of liquid entrained by air currents passing the upper vessel.

12. In a centrifugal machine for separating liquids of d fferent specific gravities, in combination, a bowl provided with openings for the passage of separated liquids, collecting vessels for the posed .about said bowl, said vessels being separated by a partition, a passageway atfording communication between said vessels, and a plurality of baflies extending from said partition and in angular relation thereto, said baflles being positioned adjacent said passageway and adapted to catch particles of liquid entrained by air currents passing from vessel to vessel.

KARL J OHAN SVENSSON.

KARL AXEL PATRIK NORLING.

separated liquids dis 

